Motorola MTR2000 T5544 Instruction / Field Service Manual page 126

Troubleshooting
Verifying Transmitter Circuitry
CAUTION
12
Performing this procedure requires that the station be taken out of ser-
vice. It is recommended that, unless the station is already out of service
!
due to an equipment malfunction, this procedure be performed during
off-peak hours so as to minimize the disruption of service to the system
subscribers.
Introduction
While most module faults can be detected by running the station diagnos-
tics provided by the RSS, the following procedure provides a more tradi-
tional method of troubleshooting the transmitter circuitry. This procedure
is useful in the event that the RSS is not at hand or for some reason cannot
be utilized (PC malfunction, etc.).
This procedure allows the service technician to make minor adjustments
and verify proper operation of the station transmit circuitry, including:
• Exciter Module
• Power Amplifier Module
• Power Supply Module
• Transmitter-related circuitry in the SCM
• Wireline Board
In general, the transmitter circuitry is exercised by injecting and measur-
ing signals using a Motorola R2001 or R2600 Communications Analyzer
(or equivalent). Incorrect measurement values indicate a faulty module(s);
measurement values within the acceptable range verify proper operation
of the above listed modules and circuitry.
Required Test Equipment
The following test equipment is required to perform the procedure:
• Motorola R2001 or R2600 Communications Analyzer (or equivalent)
• Microphone with PTT switch (GMN6147B or equivalent)
• In-Line Wattmeter (Motorola Model S-1350 or equivalent)
• Dummy Load (50Ω, station wattage or higher)
68P81096E17-E
09/30/05